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<html lang="en">
<head>
	<meta charset="UTF-8">
	<title>Document</title>
	<style>
		div {
			color: red;
		}
		span {
			color: green;
		}
		
	</style>
</head>
<body>
   标签选择器口诀：
	<div>标签选择器，</div>
	<div>页面同选起。</div>
	<div>直接写标签，</div>
	<div>全部不放弃。</div>
	<span>标签选择器，</span>
	<span>页面同选起。</span>
	<span>直接写标签，</span>
	<span>全部不放弃</span>
</body>
</html>